The tumour-associated antigen was identified with the aid of antisera obtained from rabbits immunized with 3 M KCl extract of pool human cervical carcinoma cells. The antigen was found in 92.5% specimens of human cervical squamous cell carcinoma, in 4.7% specimens of other localization of the tumours. The antigen was absent from sets of normal human tissues. The tumour-associated antigen was not identical with CEA, alpha-fetoprotein, SP1, EPA and lactoferrin and it was localized in cytoplasm of cervical carcinoma cells.
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